Defensive publication



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16. 1969, 869 O.G. 687. Tl abstracts 01. Defensive Publication applications are identified by distinctly numbered s Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oflice makr no assertion as to the novelty of the disclosed subject matter.

PUBLISHED DECEMBER 1, 1970 T881,003 PROCESS FOR BONDING A NONWOVEN WEB OF CONTINUOUS FILAMENTS Arthur John Herrman, Nashville, Tenn., assignor to E. I. du Pont de Nemours and Company, Wilmington, Del., a corporation of Delaware Filed Apr. 24, 1970, Ser. No. 31,766 Int. Cl. B29h 9/02; D04h 3/14, 5/06 US. Cl. 156-181 No Drawing. 11 Pages Specification A method for obtaining bonded continuous filament nonwoven fabric having an improved balance of physical properties which involves exposing an unbonded nonwoven web comprising a major proportion of high melting matrix filaments and a minor proportion of lower melting binder filaments having a nonround cross section to temperatures in the vicinity of the binder melting point, the degree of nonroundness of the binder filaments being characterized by a ratio of the filament cross-sectional perimeter to the square root of the cross-sectional area (PA/7f) of at least 7. Residence time at the bonding temperature should be no greater than about five seconds and preferably less than one second. 

